Estimating ankle joint impedance in the stance phase of gait using an instrumented treadmill

摘要: Quantifying increased resistance of the ankle joint to motion, referred as impedance, is important for determining appropriate treatment rehabilitation upper motor neuron (UMN) diseases. The impedance can be attributed viscoelasticity tissues surrounding clinically treated with splinting and exaggerated stretch reflexes botulinum toxin injections. choosing clinical improved if discrimination would possible between contribution tissue viscoelasticity. Ashworth Score a widely used test quantify effect UMN diseases on mechanics although it not able discriminate Moreover, performed under stationary conditions treatments are aimed at improving ability patients perform functional movement such walking. Therefore, there need improve method quantifying by discriminating two contributing factors Specifically, benefit in walking enable determined basis goal this study design evaluate identify stance phase gait. intrinsic impedance. An instrumented treadmill that measured forces moments, motion capture system positions linear model moment around was estimate underlying parameters i.e. damping stiffness well mass foot. To investigate reliability also applied 20 kg weight where estimated parameter. For experiment 21.7 average standard error mean (SEM) 8.3%. foot 3.7 SEM 68%, 2.8 Nms value 32.1% 425.1 Nm 28%. could accurately, while were low accuracy especially Overall, developed provides good future work further measurements.